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Topics referred to by the same term
A normal plane may refer to The plane perpendicular to the tangent vector of a space curve; see Frenet–Serret formulas. One of the planes containing the
Normal_plane
Line or vector perpendicular to a curve or a surface
geometry, a normal is an object (e.g. a line, ray, or vector) that is perpendicular to a given object. For example, the normal line to a plane curve at a
Normal_(geometry)
Geometric plane containing the normal vector of a given surface
geometry, a normal plane is any plane containing the normal vector of a surface at a particular point. The normal plane also refers to the plane that is perpendicular
Normal_plane_(geometry)
Directional planes
is normal to the designated orientation is the horizontal plane at P. Any plane going through P, normal to the horizontal plane is a vertical plane at
Vertical_and_horizontal
} A normal plane is normal to a tooth surface at a pitch point, and perpendicular to the pitch plane. In a helical rack, a normal plane is normal to all
List_of_gear_nomenclature
Geometrical plane which second-order contacts a submanifold
Frenet-Serret formulas as the linear span of the tangent and normal vectors. Normal plane (geometry) Osculating circle Differential geometry of curves
Osculating_plane
Mathematical function
the hyperplane normal to the space curve at t = c is also normal to the tangent at t = c. Any vector in this plane (p − a) must be normal to dr(t)/dt|t
Function_of_a_real_variable
Rotating circular machine part with teeth that mesh with another toothed part
plane. Normal circular thickness Circular thickness in the normal plane. In a helical gear it may be considered as the length of arc along a normal helix
Gear
Maximal and minimal curvature at a point of a surface
3-dimensional Euclidean space one may choose a unit normal vector. A normal plane at p is one that contains the normal vector, and will therefore also contain a
Principal_curvature
Product of the principal curvatures of a surface
a normal vector that is at right angles to the surface; planes containing the normal vector are called normal planes. The intersection of a normal plane
Gaussian_curvature
Formulas in differential geometry
the curve at a given point. The normal plane is the plane containing N and B. The projection of the curve onto this plane has the form: r ( 0 ) + ( s 2
Frenet–Serret_formulas
Set of points equidistant from a center
a plane that contains the normal with the surface will form a curve that is called a normal section, and the curvature of this curve is the normal curvature
Sphere
Orthogonality of the directions of the principal curvatures of a surface
Euclidean space, and p a point on M. A normal plane through p is a plane passing through the point p containing the normal vector to M. Through each (unit)
Euler's theorem (differential geometry)
Euler's_theorem_(differential_geometry)
Tilted flat supporting surface
humans, to be safely lowered down a vertical distance by using the normal force of the plane to reduce the gravitational force. Aircraft evacuation slides
Inclined_plane
Several equations of degree 1 to be solved simultaneously
determines a plane in three-dimensional space, and the solution set is the intersection of these planes. Thus the solution set may be a plane, a line, a
System_of_linear_equations
Concept in optics
e., the plane normal to the magnetic vectors); (2a) the plane containing the magnetic vectors and the wave-normal (i.e., the plane normal to D); (2b)
Plane_of_polarization
Plane containing the surface normal and the propagation vector of the incoming radiation
the plane of incidence (also called the incidence plane or the meridional plane[citation needed]) is the plane which contains the surface normal and the
Plane_of_incidence
Attraction that uses curved mirrors
mirror is a popular attraction at carnivals and fairs. Instead of a normal plane mirror that reflects a perfect mirror image, distorting mirrors are curved
Distorting_mirror
2025 film by Ben Wheatley
Normal is a 2025 American action comedy film directed by Ben Wheatley from a screenplay by Derek Kolstad, based on a story he co-wrote with Bob Odenkirk
Normal_(2025_film)
Probability distribution
(1996). Handbook of the Normal Distribution (2nd ed.). CRC Press. ISBN 978-0-8247-9342-5. Pearson, Karl (1901). "On Lines and Planes of Closest Fit to Systems
Normal_distribution
Flat surface
is a plane having the vector n = (a, b, c) as a normal. This familiar equation for a plane is called the general form of the equation of the plane or just
Euclidean planes in three-dimensional space
Euclidean_planes_in_three-dimensional_space
Mirror-like wave reflection
surface normal as the incident ray, but on the opposing side of the surface normal. The incident and reflected rays lie in a plane known as the plane of incidence
Specular_reflection
Surface able to be flattened without distortion
perpendicular to the circle's plane. These lines are the polar lines. Equivalently, construct the normal plane at every point. The normal planes of two infinitesimally
Developable_surface
Fracture or discontinuity in displaced rock
(0.71 in)) A normal fault in Morocco. The fault plane is the steeply leftward-dipping line in the centre of the photo, which is the plane along which the
Fault_(geology)
Texture mapping technique
Normals can be specified with a variety of coordinate systems. In computer graphics, it is useful to compute normals relative to the tangent plane of
Normal_mapping
Indian mystic (1836–1886)
him back to the plane of normal consciousness. Ramakrishna used to say the natural tendency of his mind is towards the Nirvikalpa plane and once in Samadhi
Ramakrishna
Mathematical measure of how much a curve or surface deviates from flatness
span the osculating plane, the plane containing the osculating circle. The curvature vector scaled to unit length is the unit normal vector, N: N = K ‖
Curvature
Novel series by Kim Harrison
Ever-after energy are scattered across the normal plane and are called "ley lines." Ley lines can be felt on the normal plane by magic users and the races that
Hollows_(series)
Set of values to predict occultations
specifically chosen plane, called the fundamental plane. This is the geocentric, normal plane of the shadow axis. In other words, it is the plane through the
Besselian_elements
Mirror with a flat reflecting surface
A plane mirror is a mirror with a flat (planar) reflective surface. For light rays striking a plane mirror, the angle of reflection equals the angle of
Plane_mirror
angle in a transverse plane. Normal pressure angle and normal profile angle are the pressure and profile angles in a normal plane of a helical or a spiral
Profile_angle
2D surface which extends indefinitely
In mathematics, a plane is a two-dimensional space or flat surface that extends indefinitely. A plane is the two-dimensional analogue of a point (zero
Plane_(mathematics)
Equation in analytic geometry
Hesse normal form (named after Otto Hesse) is an equation used to describe a line in the Euclidean plane R 2 {\displaystyle \mathbb {R} ^{2}} , a plane in
Hesse_normal_form
Intersection of two planes
This is found by noticing that the line must be perpendicular to both plane normals, and so parallel to their cross product n 1 × n 2 {\displaystyle {\boldsymbol
Plane–plane_intersection
Plane curved by the intersection of an earth ellipsoid and a plane
Earth section paths are plane curves defined by the intersection of an earth ellipsoid and a plane (ellipsoid plane sections). Common examples include
Earth_section_paths
Topological space
In mathematics, the Moore plane, also sometimes called Niemytzki plane (or Nemytskii plane, Nemytskii's tangent disk topology), is a topological space
Moore_plane
Zircaloy family
𝜼𝟏 direction and thickening along the 𝑲𝟏 plane normal. The twin plane, shear direction, and shear plane form the basis vectors of an orthogonal set
Zirconium_alloys
Medical condition
Normal pressure hydrocephalus (NPH), also called malresorptive hydrocephalus, is a form of communicating hydrocephalus in which excess cerebrospinal fluid
Normal_pressure_hydrocephalus
Type of wave propagating in 3 dimensions
a plane wave yields a plane wave. Any linear combination of plane waves with the same normal vector n → {\displaystyle {\vec {n}}} is also a plane wave
Plane_wave
Type of mathematical curve
In mathematics, a cubic plane curve , often called simply a cubic is a plane algebraic curve defined by a homogeneous polynomial of degree 3 in three variables
Cubic_plane_curve
Geographic coordinate specifying north-south position
formed between the vector perpendicular (or normal) to the ellipsoidal surface from the point, and the plane of the equator. Two levels of abstraction are
Latitude
Singularities of algebraic varieties
{\displaystyle \{xy=0\}} in the affine plane A 2 {\displaystyle A^{2}} over a field, viewed as a divisor, has simple normal crossings. This is the union of the
Normal_crossing_singularity
Phenomenon in crystallization
one of the normal symmetry operations of the untwinned crystal structure. For example, the twin operation may be reflection across a plane that is not
Crystal_twinning
Geometric civil engineering calculation technique
is of interest to find the maximum normal stress and maximum shear stress, as well as the orientation of the planes where they act upon. To achieve this
Mohr's_circle
Frequently-cited counterexample in topology
that even the finite product of perfectly normal spaces need not be normal. List of topologies Moore plane Kelley, John L. (1955). General Topology. van
Sorgenfrey_plane
Surgical procedure
pectoralis major muscle — which is the orientation that most approximates the normal plane of the breast. Although this surgical approach to emplacing a prosthetic
Breast_augmentation
Mirror with a curved reflecting surface
appears smaller in the mirror, they cover a wider field of view than a normal plane mirror, so useful for looking at cars behind a driver's car on a road
Curved_mirror
object and the inclined plane on each other, parallel to the surface of the plane, F N {\displaystyle F_{\mathrm {N} }} is the normal force exerted by the
Frictionless_plane
Horizontal angle from north or other reference cardinal direction
onto a reference plane (the horizontal plane); the angle between the projected vector and a reference vector on the reference plane is called the azimuth
Azimuth
Optical imaging rule
the plane of focus, the lens plane, and the image plane of an optical system (such as a camera) when the lens plane is not parallel to the image plane. It
Scheimpflug_principle
Bright spot of light that appears on shiny objects when illuminated
to be perpendicular to real surface normal N. This can be done by projection fiber direction on to plane with normal N: T = D + ( − D ⋅ N ) ∗ N ‖ D + (
Specular_highlight
Fatal air crash during take-off
damaged the plane's hydraulic system, causing the plane's brakes to fail. The captain aborted at 144 knots (267 km/h; 166 mph). The normal operating procedure
2008 South Carolina Learjet 60 crash
2008_South_Carolina_Learjet_60_crash
Representation of mechanical stress at every point within a deformed 3D object
)}\mathbf {e} _{i}} at the point P {\displaystyle P} associated with a plane with a normal vector n {\displaystyle \mathbf {n} } : T i ( n ) = lim Δ S →
Cauchy_stress_tensor
Clinical application of cephalometry (measurement of parts of the head)
the X-ray source is placed a steady five feet away from the mid sagittal plane, with film situated just 15 cm from there. This allows for accurate measurements
Cephalometric_analysis
Thin-walled structural element
dimensions. It is characterized in structural terms by mid-plane stress which is both coplanar and normal to the surface. A shell can be derived from a plate
Shell_(structure)
2025 aviation accident in Louisville, Kentucky, US
Retrieved November 6, 2025. Searcy, Leigh (November 5, 2025). "Tuesday's plane crash in Louisville marks the deadliest in UPS history". LEX 18. WLEX-TV
UPS_Airlines_Flight_2976
Description of the moon's motion
ecliptic plane. The Moon's rotational axis precesses so as to trace out a cone that intersects the ecliptic plane as a circle. A plane formed from a normal to
Cassini's_laws
Examination of the heart's electrical activity
electrical vector) in the frontal plane. It is often sufficient to classify the axis as one of three types: normal, left deviated, or right deviated.
Electrocardiography
1985 novel by Greg Bear
assimilated conventional humans, is eventually forced to abandon the normal plane of existence in favor of one in which thought does not require a physical
Blood_Music_(novel)
2023 single by English rock band Lovejoy
video for encapsulating the song's meaning, starting "with a seemingly normal plane ride" before it "escalates into utter chaos". Lovejoy Ash Kabosu – bass
Call Me What You Like (Lovejoy song)
Call_Me_What_You_Like_(Lovejoy_song)
Region of space in the modeled world that may appear on the screen
objects themselves. VPN the view-plane normal – a normal to the view plane. VUV the view-up vector – the vector on the view plane that indicates the upward direction
Viewing_frustum
Mathematical term in complex analysis
complex plane via the inverse of stereographic projection. Paul Montel first coined the term "normal family" in 1911. Because the concept of a normal family
Normal_family
Geometric concept of a 2D space with "points at infinity" adjoined
mathematics, a projective plane is a geometric structure that extends the concept of a plane. In the ordinary Euclidean plane, two lines typically intersect
Projective_plane
1977 aviation accident in Mississippi, USA
at Louisiana State University. The plane ran out of fuel near the end of the flight. Upon realizing that the plane had insufficient fuel, the pilots attempted
Lynyrd_Skynyrd_plane_crash
Straight figure with zero width and depth
closest point on the line to the origin. The normal form of the equation of a straight line on the plane is given by: x cos φ + y sin φ − p = 0 ,
Line_(geometry)
Vector of length one
{\boldsymbol {\hat {\varphi }}}} , the direction in which the angle in the x-y plane counterclockwise from the positive x-axis is increasing; and θ ^ {\displaystyle
Unit_vector
Plane of existence in Dungeons & Dragons
Outer Plane is one of a number of general types of planes of existence. They can also be referred to as godly planes, spiritual planes, or divine planes. The
Outer_Plane
Optical device used with a camera to create images
lens at the pinhole with a focal length equal to the distance to the film plane (assuming the camera will take pictures of distant objects). This allows
Camera_lens
Force exerted on an object by a body with which it is in contact, and vice versa
incline as in Figures 1 and 2, the normal force is perpendicular to the plane the object rests on. Still, the normal force will be as large as necessary
Normal_force
American lawyer (1858-1942)
capable of movement to different positions above or below [sic] the normal plane of the body of the aeroplane, such movement being about an axis traverse
Harry_Aubrey_Toulmin_Sr.
When the stress vector within a material is zero across a particular plane
the normal stress σ n {\displaystyle \sigma _{\mathrm {n} }\,\!} and the shear stress τ n {\displaystyle \tau _{\mathrm {n} }\,\!} on any plane perpendicular
Plane_stress
Geometric model of the planar projection of the physical universe
In mathematics, a Euclidean plane is a Euclidean space of dimension two, denoted E 2 {\displaystyle {\textbf {E}}^{2}} or E 2 {\displaystyle \mathbb {E}
Euclidean_plane
Type of fluid motion where all flow velocities are parallel to a fixed plane
velocity at every point is parallel to a fixed plane. The velocity at any point on a given normal to that fixed plane should be constant. Considering a two dimensional
Two-dimensional_flow
Generalization of the one-dimensional normal distribution to higher dimensions
normal distribution, multivariate Gaussian distribution, or joint normal distribution is a generalization of the one-dimensional (univariate) normal distribution
Multivariate normal distribution
Multivariate_normal_distribution
Role-playing game multiverse
The planes of the Dungeons & Dragons roleplaying game constitute the multiverse in which the game takes place. Each plane is a universe with its own rules
Plane_(Dungeons_&_Dragons)
Type of topological space
regular locally normal space that is not normal is the Nemytskii plane. Most spaces encountered in mathematical analysis are normal Hausdorff spaces
Normal_space
Equations of light transmission and reflection
electric field in the plane of incidence (the xy plane in the derivation below); then the magnetic field is normal to the plane of incidence. The names
Fresnel_equations
Notation system for crystal lattice planes
indicates a normal to the planes in the basis of the primitive reciprocal lattice vectors. Because the coordinates are integers, this normal is itself always
Miller_index
Form of the mineral quartz, found in nuclear test sites and meteor impact zones
different from normal quartz. Under intense pressure (but limited temperature), the crystalline structure of quartz is deformed along planes inside the crystal
Shocked_quartz
In mathematics, straight line touching a plane curve without crossing it
In geometry, the tangent line (or simply tangent) to a plane curve at a given point is, intuitively, the straight line that "just touches" the curve at
Tangent
links, by using the "common normal distance" and the angle between the link axes in a plane perpendicular to the common normal. When two consecutive joint
Common_normal_(robotics)
Canadian actor (born 1981)
season of the HBO series True Detective (2015) and the television film The Normal Heart (2014), as well as portrayed David Koresh in the Paramount Network
Taylor_Kitsch
Vertical datum used in Germany
datum used in Germany. In geographical terms, NHN is the reference plane for the normal height of a topographical eminence height above mean sea level used
Normalhöhennull
Set of bivariate correlations among galaxies
The fundamental plane is a set of bivariate correlations connecting some of the properties of normal elliptical galaxies. Some correlations have been empirically
Fundamental plane (elliptical galaxies)
Fundamental_plane_(elliptical_galaxies)
Angle in geometric optics
equivalently described as the angle between the tangent plane of the surface and another plane at right angles to the light rays. This means that the illumination
Angle_of_incidence_(optics)
Coordinates comprising a distance and an angle
In mathematics, the polar coordinate system specifies a given point in a plane by using a distance and an angle as its two coordinates. These are the point's
Polar_coordinate_system
Abnormal yellowish skin colour caused by high level of bilirubin
associated symptoms of jaundice are itchiness, pale feces, and dark urine. Normal levels of bilirubin in blood are below 1.0 mg/dl (17 μmol/L), while levels
Jaundice
Reflected duplication of an object
mirror in the y, z plane) has coordinates (−x, y, z). Thus reflection is a reversal of the coordinate axis perpendicular (normal) to the mirror's surface
Mirror_image
NASA probe to study solar wind, at L1 since 1995
resolution within ± 22.5° of the ecliptic plane (increases to 22.5° at normal incidence to ecliptic plane). The analyzers are swept logarithmically in
Wind_(spacecraft)
Physical quantity that changes sign with improper rotation
normal to an oriented plane. An oriented plane can be defined by two non-parallel vectors, a and b, that span the plane. The vector a × b is a normal
Pseudovector
Study of geometry using a coordinate system
surface normal, or simply normal, to a surface at a point P is a vector that is perpendicular to the tangent plane to that surface at P. The word "normal" is
Analytic_geometry
Commercial airport near Bloomington, Illinois, USA
for a municipally owned or operated airport. In 1928, the Normal field featured a six-plane hangar, fueling pump, wind cone, a circle of crushed stone
Central Illinois Regional Airport
Central_Illinois_Regional_Airport
Conventions used in the robotics research field
line with the plane through the origin of the world reference frame, and normal to the line. The reference frame on this normal plane has the same origin
Line representations in robotics
Line_representations_in_robotics
Standard terms for unambiguous description of relative placement of body parts
transverse plane, also called the axial plane or horizontal plane, is perpendicular to the other two planes. Sagittal planes and transverse planes are used
Anatomical_terms_of_location
Geometrical concept
the plane section). If instead the plane section is taken for a fixed value of the density, the result is an iso-density contour. For the normal distribution
Cross_section_(geometry)
3D computer graphics program
subsurface scattering), dynamic simulation, particle systems, radiosity, normal map creation and rendering, global illumination, a customizable user interface
Autodesk_3ds_Max
Measure of how strongly an optical system converges or diverges light
consider a normal lens for a 35 mm camera with a focal length of f = 50 mm. To focus a distant object (s1 ≈ ∞), the rear principal plane of the lens
Focal_length
Neighborhood of a submanifold
a manifold M, and let N be the normal bundle of S in M. Here S plays the role of the curve and M the role of the plane containing the curve. Consider
Tubular_neighborhood
Distance from one geometric object to another along a line perpendicular to both
all lines in the plane that pass through the nearest point in the plane to the given point. Other instances include: Point on plane closest to origin
Perpendicular_distance
Relationship between two lines that meet at a right angle
and a plane, and between two planes. Perpendicular is also used as a noun: a perpendicular is a line which is perpendicular to a given line or plane. Perpendicularity
Perpendicular
NORMAL PLANE
NORMAL PLANE
Girl/Female
Indian
Soft
Female
English
 Feminine form of English Norman, NORMA means "northman." Compare with another form of Norma.
Girl/Female
American, Australian, British, Chinese, Christian, Danish, English, Finnish, French, German, Latin, Swedish
From the North; Pattern; Courage; Norseman; Rule; Standard; Female Version of Norman
Girl/Female
Indian, Punjabi, Sikh, Telugu
Pure; Without Any Impurity
Female
Italian
 Italian name invented by Felice Romani in his libretto for Belini's opera of the same name, derived from Latin norma, NORMA means "standard, rule." Compare with another form of Norma.
Boy/Male
Assamese, Bengali, Celebrity, Gujarati, Hindu, Indian, Jain, Kannada, Malayalam, Marathi, Punjabi, Sikh, Sindhi, Tamil, Telugu, Traditional
Kindness; Clean; Pure; Talent Person; The One who is Pure
Boy/Male
American, Australian, French, Scottish
From the Northern Town
Female
English
English name derived from the gem name, from Latin corallium, probably ultimately from Hebrew goral, CORAL means "small pebble."
Boy/Male
Biblical
Treasurer of Nergal.
Male
English
English form of Norwegian Normund, NORMAND means "north protection."
Surname or Lastname
English, Irish (Ulster), Scottish, and Dutch
English, Irish (Ulster), Scottish, and Dutch : name applied either to a Scandinavian or to someone from Normandy in northern France. The Scandinavian adventurers of the Dark Ages called themselves norðmenn ‘men from the North’. Before 1066, Scandinavian settlers in England were already fairly readily absorbed, and Northman and Normann came to be used as bynames and later as personal names, even among the Saxon inhabitants. The term gained a new use from 1066 onwards, when England was settled by invaders from Normandy, who were likewise of Scandinavian origin but by now largely integrated with the native population and speaking a Romance language, retaining only their original Germanic name.French : regional name for someone from Normandy.Dutch : ethnic name for a Norwegian.Jewish (Ashkenazic) : variant of Nordman.Jewish : Americanized form of some like-sounding Ashkenazic name.Swedish : from norr ‘north’ + man ‘man’.Albert Andriessen Bradt, a settler in Rensselaerswijck on the upper Hudson River in NY, was originally from Norway and was known as de Norrman (‘the Norwegian’). The waterway south of Albany which powered his mills became known as the Normanskill (‘the Norman’s Waterway’), by which name it is still known today.
Boy/Male
Shakespearean
Hamlet, Prince of Denmark' Fortinbras, Prince of Norway.
Boy/Male
Hindu
Clean, Pure
Girl/Female
Latin American
Rule; pattern. Can also be a feminine form of Norman: from the North.
Male
Scottish
Scottish form of Irish Gaelic Cormac, CORMAG means "son of defilement."
Biblical
treasurer of Nergal
Boy/Male
French Teutonic American English German
From the north.
Boy/Male
Afghan, Arabic
Handsome
Male
English
English form of Teutonic Nordemann, NORMAN means "northman."
Boy/Male
Scottish American
From the north valley.
NORMAL PLANE
NORMAL PLANE
Boy/Male
American, Anglo, Australian, British, English
Meadow of Ash Trees; Son of Pool Surrounded by Ash Trees; Ash-tree Meadow
Girl/Female
Hindu
Boy/Male
Spanish
Conquer.
Surname or Lastname
English
English : habitational name for someone from Genoa in Italy, from a medieval folk-etymological alteration of Italian Geno(v)a (see Gannaway).
Girl/Female
French
Thinker.
Boy/Male
Tamil
Yoganath | யோகநாதÂ
Boy/Male
Arabic, Muslim, Sindhi
Better
Girl/Female
Tamil
Chakradharini | சகà¯à®°à®¤à®¾à®°à¯€à®¨à¯€
The Goddess who is armed with a wheel
Girl/Female
Tamil
Rukhmambari | à®°à¯à®•à¯à®®à®¾à®‚à®®à¯à®ªà®°à¯€
Name of a Raga
Boy/Male
Hindu, Indian, Russian
Mine of Nectar
NORMAL PLANE
NORMAL PLANE
NORMAL PLANE
NORMAL PLANE
NORMAL PLANE
n.
See Mormal.
a.
Northern; pertaining to the north, or to the north wind; as, a boreal bird; a boreal blast.
a.
Not according to rule; abnormal.
a.
Denoting certain hypothetical compounds, as acids from which the real acids are obtained by dehydration; thus, normal sulphuric acid and normal nitric acid are respectively S(OH)6, and N(OH)5.
n.
See Wormil.
a.
According to a square or rule; perpendicular; forming a right angle. Specifically: Of or pertaining to a normal.
a.
According to an established norm, rule, or principle; conformed to a type, standard, or regular form; performing the proper functions; not abnormal; regular; natural; analogical.
a.
Pertaining to, or situated near, the back, or dorsum, of an animal or of one of its parts; notal; tergal; neural; as, the dorsal fin of a fish; the dorsal artery of the tongue; -- opposed to ventral.
n.
See Wormil.
a.
Of or pertaining to Normandy or to the Normans; as, the Norman language; the Norman conquest.
a.
Denoting that series of hydrocarbons in which no carbon atom is united with more than two other carbon atoms; as, normal pentane, hexane, etc. Cf. Iso-.
a.
Alt. of Loral
a.
Human; belonging to man, who is mortal; as, mortal wit or knowledge; mortal power.
a.
Sound; normal.
a.
Serving to teach or convey a moral; as, a moral lesson; moral tales.
adv.
In a normal manner.
a.
Done in due form, or with solemnity; according to regular method; not incidental, sudden or irregular; express; as, he gave his formal consent.
a.
Both renal and portal. See Portal.
a.
Having the form or appearance without the substance or essence; external; as, formal duty; formal worship; formal courtesy, etc.
n.
The quality, state, or fact of being normal; as, the point of normalcy.